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gzencode

(PHP 4 >= 4.0.4, PHP 5)

gzencode -- Create a gzip compressed string

说明

string gzencode ( string data [, int level [, int encoding_mode]] )

This function returns a compressed version of the input data compatible with the output of the gzip program.

For more information on the GZIP file format, see the document: GZIP file format specification version 4.3 (RFC 1952).

参数

data

The data to encode.

level

The level of compression. Can be given as 0 for no compression up to 9 for maximum compression. If not given, the default compression level will be the default compression level of the zlib library.

encoding_mode

The encoding mode. Can be FORCE_GZIP (the default) or FORCE_DEFLATE.

If you use FORCE_DEFLATE, you get a standard zlib deflated string (inclusive zlib headers) after the gzip file header but without the trailing crc32 checksum.

返回值

The encoded string, or FALSE if an error occurred.

例

The resulting data contains the appropriate headers and data structure to make a standard .gz file, e.g.:

例子 1. Creating a gzip file

<?php
$data = implode("", file("bigfile.txt"));
$gzdata = gzencode($data, 9);
$fp = fopen("bigfile.txt.gz", "w");
fwrite($fp, $gzdata);
fclose($fp);
?>

更新日志

版本说明
4.2 level was added. gzencode() only had the data and the optional encoding_mode parameters before.

参见

gzdeflate()
gzinflate()
gzuncompress()
gzcompress()



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